I won’t tell the student the answer to the math problem until he______ on it for more than an hour.

Because he is ______head of the government, he is supposed ______.

依次填人下面一段文字横线处的语句，衔接最恰当的一组是 有些人就是因为别人的这样一句看似轻描淡写的话而名声扫地。只有那些不在乎权力的人， 才可以根本不在乎别人的风言风语和恶意的评论。①含蓄地批评别人是人际交往中十分精妙的一点②是检测一个人是否具有能够了解他人内心的智慧的有效手段③是否能够巧妙地批评别人④也是一门处世的艺术⑤这样的批评就如同一道突如其来的闪电，能把你的好名声击得粉碎⑥有些批评是怀有恶意的沙子，其中隐藏着嫉妒和愤怒的毒药

I have no fear of the clouds, ______ may block my sight, as I am already at the top of the height.

the early nineties, the trend in mostbusinesses has been toward on-demand, always-available products and servicesthat suit the customer’s ________ rather than the company’s.